[css-scoping-1] Update Changes section

Author: xfq

css-scoping-1/Overview.bs

@@ -542,11 +542,18 @@ Changes</h2>
 	<a href="https://www.w3.org/TR/2014/WD-css-scoping-1-20140403/">3 April 2014 Working Draft</a>.
 
 	* Renamed <css>::content</css> to ''::slotted''.
-	* Define the flattened tree
+	* Define the flattened tree.
 	* Generally reorg and rebase the Shadow DOM section on top of current DOM.
 	* Punt <css>@scope</css> and related things,
 		and <css>::region</css> and related things,
 		to the next level of the draft.
+	* Define the specificity of '':host'', '':host()'', '':host-context()'', and ''::slotted()''
+	* Remove the <css>>>></css> (previously called <css>/deep/</css>) combinator.
+	* Define that tree-abiding pseudos are allowed after ''::slotted()''.
+	* Allow <<compound-selector-list>> in all the pseudos.
+	* Define a way to create a stylesheet of default element styles for a given element.
+	* Make featureless elements match nothing.
+	* Define <a>in the context of a shadow tree</a>.
 
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